go: handle SIGINT gracefully

run.go

@@ -1,8 +1,12 @@
 package main
 
 import (
+	"context"
 	"flag"
 	"net/http"
+	"os"
+	"os/signal"
+	"time"
 
 	"git.dotya.ml/mirre-mt/pcmt/app"
 	"git.dotya.ml/mirre-mt/pcmt/config"
@@ -37,7 +41,24 @@ func run() error {
 		return c.String(http.StatusOK, "Hello there.")
 	})
 
-	if err = e.Start(*addr); err != nil {
+	go func() {
+		if err = e.Start(*addr); err != nil && err != http.ErrServerClosed {
+			logger.Println("shutting down the server")
+		}
+	}()
+
+	quit := make(chan os.Signal, 1)
+
+	signal.Notify(quit, os.Interrupt)
+	<-quit
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer func() {
+		logger.Println("Interrupt received, gracefully shutting down the server")
+		cancel()
+	}()
+
+	if err = e.Shutdown(ctx); err != nil {
 		return err
 	}